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Chapter 12: Q13CQ (page 426)
Why does a sailboat need a keel?
Keel helps to create a pressure difference underwater and counteracts the effect of wind which causes leeway.
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A perfume bottle or atomizer sprays a fluid that is in the bottle. (Figure 12.25.) How does the fluid rise up in the vertical tube in the bottle?
Why would you expect the rate of diffusion to increase with temperature? Can you give an example, such as the fact that you can dissolve sugar more rapidly in hot water?
If you took two marbles of different sizes, what would you expect to observe about the relative magnitudes of their terminal velocities?
When paddling a canoe upstream, it is wisest to travel as near to the shore as possible. When canoeing downstream, it may be best to stay near the middle. Explain why.
The flow rate of blood through a \({\bf{2}}{\bf{.00 \times 1}}{{\bf{0}}^{{\bf{ - 6}}}}\;{\bf{m}}\)-radius capillary is \({\bf{3}}{\bf{.80 \times 1}}{{\bf{0}}^{\bf{9}}}\;{\bf{c}}{{\bf{m}}^{\bf{3}}}{\bf{/s}}\) . (a) What is the speed of the blood flow? (This small speed allows time for diffusion of materials to and from the blood.) (b) Assuming all the blood in the body passes through capillaries, how many of them must there be to carry a total flow of\({\bf{90}}\;{\bf{c}}{{\bf{m}}^{\bf{3}}}{\bf{/s}}\)? (The large number obtained is an overestimate, but it is still reasonable.)
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